Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

183
FXUS63 KLOT 301730
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1230 PM CDT Sat May 30 2026

.KEY MESSAGES...

- Dangerous swimming conditions are anticipated at Lake Michigan
  beaches today, particularly in Illinois. A Beach Hazards
  Statement is in effect today for a High Swim Risk along the
  Illinois lakeshore.

- A stagnant, predominantly precipitation free pattern will
  prevail through at least mid next week, with seasonably warm
  daytimes inland, and cooler temperatures closer to the lake.

&&

.DISCUSSION...
Issued at 223 AM CDT Sat May 30 2026

Our quiet stretch of weather continues here as we enter the
weekend. Pressure trends will be on the rise around the Great
Lakes today with a surface high expanding into the region from
the north leading to another rain-free late spring day. A fair
amount of sunshine will be filtered by some passing cirrus.
Breezy east winds today are expected to transport cooler air
well inland of the lake with upper 60s forecast along the
lakeshore and 70s around the city and across the west and
northwest suburbs while lower 80s are anticipated farther west
and south.

The breezy onshore winds will also lead to dangerous swimming
conditions at Illinois Lake Michigan beaches today. Swimming
will be become dangerous even for experienced swimmers with
hazardous waves and currents building quickly through the
morning as winds pick up. A Beach Hazards Statement is in effect
today for a High Swim Risk along the IL lakeshore. Hazardous
swimming conditions may also be present at Lake County, IN
beaches today where we`re currently highlighting a Moderate Swim
Risk.

Similar conditions are anticipated tomorrow. Afternoon highs
are forecast in the middle 70s to lower 80s inland and cooler
near the lake. A persistent upper wave stirring over the High
Plains west of the blocking upper high will drape a quasi-
stationary baroclinic zone west of the Mississippi River over
the weekend driving frequent chances for rain out that way. In
the early stages of this blocking pattern breaking, guidance is
in agreement on that baroclinic zone meandering east of the
river and possibly dropping some pockets of rain on parts of
western and central IL Sunday night into Monday, which could
include far western and southwestern portions of our CWA. There
will be some dry low level air to combat with meager forcing,
but just enough elevated instability may be present to stir up a
couple of true showers. Otherwise, if anything, looking like
pockets of lighter rain with QPF output largely ranging between
trace amounts and a few hundredths of an inch around our west
and southwest, though a few pockets of more meaningful amounts
may be possible. At this point, not forecasting any rain chances
into the Chicago metro.

The blocking pattern will break early next week and meander
about the region through the middle of the week resulting in
continued quiet weather. Highs are forecast generally in the
lower 80s for the first half of the work week with cooler
conditions near the lake and no rain chances beyond the slight
chances into Monday. The prominent surface high will push off
the Mid-Atlantic coast late next week and the return flow should
bring warming temperatures to the area. There`s quite a lot of
spread in temperature guidance out at this range with more 80s
favored, but some potential for upper 80s/near 90 late in the
week.

Doom

&&

.AVIATION /18Z TAFS THROUGH 00Z MONDAY/...
Issued at 1230 PM CDT Sat May 30 2026

Brisk east-northeast winds are expected until this evening.
Winds likely gusty at times, up to around 20kt, the rest of this
afternoon. Easterly winds will gradually ease this evening,
then likely pick up a bit again later tomorrow morning into
tomorrow afternoon. Winds will be a bit lighter Sunday
afternoon than this afternoon.

VFR conditions are expected through the 18z TAF cycle.

- Izzi

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Beach Hazards Statement until 9 PM CDT this evening for ILZ006-
     ILZ103-ILZ104.

IN...None.
LM...Small Craft Advisory until 9 PM CDT this evening for the IL
     nearshore waters.

&&

$$

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